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Since the appearance of the first California-type models around 1940, the profilograph has been a popular device used for quality control in the construction of pavements. Both roadway and airfield landing agencies have adopted roughness indexes computed from profilograph-derived measurements as a level of construction quality. Emerging high-speed inertial profilers can now quickly collect…
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A proposed new standard being developed by ASTM International Committee E17 on Vehicle-Pavement Systems will be the first to describe how truth-in-data should be applied to traffic monitoring data collection, summarization and reporting. WK25280 , Practice for Highway Traffic Monitoring Truth-in-Data, is under the jurisdiction of Subcommittee E17.52 on Traffic Monitoring. Current traffic…
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Being able to compile and interpret data on how traffic turns through an intersection could have an impact on future environmental and safety decisions regarding intersection geometry and traffic control. However, until recently no standard has existed to properly obtain and use this data. Now, ASTM International Committee E17 on Vehicle-Pavement Systems has approved E2667 , Practice for…
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Honeycomb ceramics, porous with linear hollow channels, are being used worldwide in automotive catalytic converters and as diesel particulate filters for trucks. Flexural testing of this type of ceramics is addressed in a new ASTM International standard, ASTM C1674 , Test Method for Flexural Strength of Advanced Ceramics with Engineered Porosity (Honeycomb Cellular Channels) at Ambient…
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New Advanced Ceramics Standards from ASTM Cover Fracture Mirror Size Analysis, Tensile Strength DataSubcommittee C28.01 on Mechanical Properties and Performance, part of ASTM International Committee C28 on Advanced Ceramics, has recently approved two new standards, ASTM C1678 , Practice for Fractographic Analysis of Fracture Mirror Sizes in Ceramics and Glasses, and ASTM C1683 , Practice for Size Scaling of Tensile Strengths Using Weibull Statistics for Advanced Ceramics., ASTM C1678 —Bringing Consistency to Fracture Mirror Size Analysis, Fracture mirror size analysis is a powerful quantitative tool for the interpretation of broken ceramic and glass articles. While this type of analysis can be used to determine the stress in a part at the instant of fracture, inspection and interpretation procedures have often varied, resulting in uncertainty in stress estimates. ASTM C1678, Practice for Fractographic Analysis of Fracture Mirror…, ASTM C1683 —Scaling Strength Values, ASTM C1683, Practice for Size Scaling of Tensile Strength Using Weibull Statistics for Advanced Ceramics, provides methodology to convert fracture strength parameters estimated from data obtained with one test geometry to strength parameters representing other test geometries. Stephen Duffy, chair of civil engineering, Cleveland State University, and C28 member, says that companies producing…
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Ceramic and glass companies, as well as universities and government laboratories, will be the primary users of a new ASTM standard that allows for the flexural strength determination of components made in a round shape or after finish machining with minimal waste. The standard, ASTM C1684 , Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature-Cylindrical Rod Strength, was…
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ASTM International Committee C28 on Advanced Ceramics and the American Ceramic Society are co-sponsoring a workshop, Needs and Opportunities for Strength and Fracture Standards at Micro and Nano Scales, on Jan. 27, 2008, from 1:00 to 5:00 p.m. at the Hilton Daytona Beach Resort in Daytona Beach, Fla. The workshop will be held in conjunction with the ASTM Committee C28 meetings to be held Jan. 26-…
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Drawing on the best practices of the U.S. Federal Highway Administration and the states, ASTM International Committee E17 on Vehicle-Pavement Systems has developed a new standard, E 2561 , Practice for Installation of Inductive Loop Detectors. E 2561 is under the jurisdiction of Subcommittee E17.52 on Traffic Monitoring. Inductive loop detectors are installed in sawed slots in roadway pavement…
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Airport operators, military pavement maintenance personnel, transportation regulatory agencies and state highway departments will all benefit from the approval of a new ASTM standard for measuring skid resistance. The standard, E 2340 , Test Method for Measuring the Skid Resistance of Pavements and Other Trafficked Surfaces Using a Continuous Reading, Fixed-Slip Technique, was developed by…
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Two new standards developed by ASTM International Committee E17 on Vehicle Pavement Systems will provide uniform specification and test criteria for agencies and manufacturers that deal with traffic monitoring devices. The new standards, which are both under the jurisdiction of Subcommittee E17.52 on Traffic Monitoring, are E 2300 , Specification for Highway Traffic Monitoring Devices, and E 2532…